- Holy Spirit1
- Horses--Diseases1
- House furnishings1
- House of Burgundy, 1384-14771
- Human anatomy1
- Human reproduction1
- Humorous poetry, German1
- Hussites1
- Hymnals1
- Hymns, Armenian1
- Hymns, Latin1
- Hypothesis1
- Ibn al-Nafīs, ʻAlī ibn Abī al-Ḥazm, 1210 or 1211-1288. Mūjiz1
- Ibn Ḥijjah al-Ḥamawī, Taqī al-Dīn Abū Bakr ibn ʻAlī, -1434. Badīʻīyah1
- Illumination of books and manuscripts, Flemish1
- Illumination of books and manuscripts, French1
- Indulgences1
- Indulgences (Canon law)1
- Inheritance and succession (Roman law)1
- Innocent VIII, Pope, 1432-14921